Cookie Manager

Cookie Manager is a Javascript library for dealing with cookie compliance.

It can handle removing cookies the user does not consent to or are not defined in the manifest. It can also handle the storing of user preferences when it comes to cookies, and displaying a banner when no preferences have been set.

Installation

NPM

npm install @dvsa/cookie-manager

Usage

Include the cookie-manager.js script on your web pages:

<script src="./cookie-manager.js"></script>

Invoke the Cookie Manager by calling init() with a config:

cookieManager.init(configuration_object);

Feature: Cookie Banner

To disable this functionality, set the configuration value of cookie-banner-id to false or remove the definition.

If you want functionality to display a cookie banner when user preferences have not been set (or expired) then build your cookie banner markup, and give the wrapping element an ID and match it with the configuration value cookie-banner-id. The banner will be hidden using the HTML hidden attribute.

If the banner includes a button element with the value accept the library will also bind to the click event of the button and upon user click, mark all optional categories as opt-in.

If the banner includes a button element with the value reject the library will also bind to the click event of the button and upon user click, mark all optional categories as opt-out.

The banner's hidden class will then be restored.

<header id="cm_cookie_notification" class="hidden">
    <div class="govuk-cookie-banner " data-nosnippet role="region" aria-label="Cookies on [name of service]">
        <div class="govuk-cookie-banner__message govuk-width-container">

            <div class="govuk-grid-row">
                <div class="govuk-grid-column-two-thirds">
                    <h2 class="govuk-cookie-banner__heading govuk-heading-m">Cookies on [name of service]</h2>

                    <div class="govuk-cookie-banner__content">
                        <p class="govuk-body">We use some essential cookies to make this service work.</p>
                        <p class="govuk-body">We’d also like to use analytics cookies so we can understand how you use the service and make improvements.</p>
                    </div>
                </div>
            </div>

            <div class="govuk-button-group">
                <button value="accept" type="button" name="cookies" class="govuk-button" data-module="govuk-button">
                    Accept analytics cookies
                </button>
                <button value="reject" type="button" name="cookies" class="govuk-button" data-module="govuk-button">
                    Reject analytics cookies
                </button>
                <a class="govuk-link" href="#">View cookies</a>
            </div>
        </div>
    </div>
</header>

Feature: User Preferences Saving

To disable this functionality, set the configuration value of user-preference-configuration-form-id to false or remove the definition.

If you want functionality to setup a user preference cookie, then you need to define a HTML form with an ID and match that to the configuration value user-preference-configuration-form-id. Upon initialisation, the library will look for the form when the DOM is ready, and bind to the submit event. When submitted, the library will collect the value of all radio buttons with the checked state. The name of the radio buttons must reflect the category name for cookies defined in your manifest. The values for the radio buttons must be on and off.

<form id="cm_user_preference_form">
    <fieldset>
        <legend>Analytics:</legend>
        <input type="radio" name="analytics" value="on" /> On <br/>
        <input type="radio" name="analytics" value="off" checked /> Off <br/>
    </fieldset>

    <fieldset>
        <legend>Feedback:</legend>
        <input type="radio" name="feedback" value="on" /> On <br/>
        <input type="radio" name="feedback" value="off" checked /> Off <br/>
    </fieldset>

    <input type="submit" value="Save Preferences"/>
</form>

Configuration

Configuration is done when calling init() on the Cookie Manager object and is used to determine how you want the Cookie Manager to behave, and defines a manifest of cookies used on your site.

Using this method, it allows developers to use the native configuration in their application and it should be as simple as serialising the top-level configuration object/array for Cookie Manager to JSON and putting the result into the init() function (either as a variable or directly):

cm.init(
  {
    "delete-undefined-cookies": true,
    "...": "..."
  }
);

Configuration Schema

{
  "delete-undefined-cookies": true,
  "user-preference-cookie-name": "cm-user-preferences",
  "user-preference-cookie-secure": false,
  "user-preference-saved-callback" : false, //accept a function
  "user-preference-cookie-expiry-days": 365,
  "user-preference-configuration-form-id": "cookie-manager-form",
  "cookie-banner-id": "cm_cookie_notification",
  "cookie-banner-visible-on-page-with-preference-form": false,
  "cookie-banner-saved-callback": false, //accept a function
  "set-checkboxes-in-preference-form": true,
  "cookie-manifest": [
    {
      "category-name": "essential",
      "optional": false,
      "cookies": [
        "essential-cookie",
        "another-essential-cookie",
        "some-imperva-cookie",
        "some-other-imperva-cookie"
      ]
    },
    {
      "category-name": "analytics",
      "optional": true,
      "cookies": [
        "_ga",
        "_gtm"
      ]
    },
    {
      "category-name": "feedback",
      "optional": true,
      "cookies": [
        "_hotjar",
        "_surveything"
      ]
    }
  ]
}

Development

Unit tests

The Unit Test will fail if the coverage is below 80%. To run the tests run npm run test or npm run test-html.

HTML

Running npm run test-html will generate a nice html output for the unit tests and coverage in /test and /coverage respectivly.

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

License

MIT